Specific heat and magnetic order in LaMnO/sub 3+[delta]/

Detalhes bibliográficos
Autor(a) principal: Ghivelder, Luis
Data de Publicação: 1999
Outros Autores: Abrego-Castillo, Ildeman, Gusmao, Miguel Angelo Cavalheiro, Alonso, José Antônio, Cohen, Lesley F.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/103860
Resumo: Magnetic and specific-heat measurements are performed in three different samples of LaMnO₃₊[delta], with δ = 0.11, 0.15, and 0.26, presenting important disorder effects, such as carrier localization, due to high amounts of La and Mn vacancies. For the samples with δ = 0.11 and 0.15, magnetic measurements show signatures of a two-step transition: as the temperature is lowered, the system enters a ferromagnetic phase followed by a disorder-induced cluster-glass state. Spin-wave-like contributions and an unexpected large linear term are observed in the specific heat as a function of temperature. In the sample with the highest vacancy content, δ = 0.26, the disorder is sufficient to suppress even short-range ferromagnetic order and yield a spin-glass-like state.
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spelling Ghivelder, LuisAbrego-Castillo, IldemanGusmao, Miguel Angelo CavalheiroAlonso, José AntônioCohen, Lesley F.2014-09-26T02:10:56Z19991098-0121http://hdl.handle.net/10183/103860000294570Magnetic and specific-heat measurements are performed in three different samples of LaMnO₃₊[delta], with δ = 0.11, 0.15, and 0.26, presenting important disorder effects, such as carrier localization, due to high amounts of La and Mn vacancies. For the samples with δ = 0.11 and 0.15, magnetic measurements show signatures of a two-step transition: as the temperature is lowered, the system enters a ferromagnetic phase followed by a disorder-induced cluster-glass state. Spin-wave-like contributions and an unexpected large linear term are observed in the specific heat as a function of temperature. In the sample with the highest vacancy content, δ = 0.26, the disorder is sufficient to suppress even short-range ferromagnetic order and yield a spin-glass-like state.application/pdfengPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 60, no. 17 (Nov. 1999), p. 12184-12190Materiais ferromagnéticosEstrutura magnéticaCalor especificoVidros de spinVacancias cristalSpecific heat and magnetic order in LaMnO/sub 3+[delta]/Estrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000294570.pdf000294570.pdfTexto completo (inglês)application/pdf114030http://www.lume.ufrgs.br/bitstream/10183/103860/1/000294570.pdf8179d0195cd3f82a94859f81d18d0849MD51TEXT000294570.pdf.txt000294570.pdf.txtExtracted Texttext/plain33501http://www.lume.ufrgs.br/bitstream/10183/103860/2/000294570.pdf.txtf88840da415b30bd13a9c1fe7390a327MD52THUMBNAIL000294570.pdf.jpg000294570.pdf.jpgGenerated Thumbnailimage/jpeg1949http://www.lume.ufrgs.br/bitstream/10183/103860/3/000294570.pdf.jpgecbd4791b3b45cbeabf8dfde9572831cMD5310183/1038602018-10-08 08:13:54.981oai:www.lume.ufrgs.br:10183/103860Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-08T11:13:54Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Specific heat and magnetic order in LaMnO/sub 3+[delta]/
title Specific heat and magnetic order in LaMnO/sub 3+[delta]/
spellingShingle Specific heat and magnetic order in LaMnO/sub 3+[delta]/
Ghivelder, Luis
Materiais ferromagnéticos
Estrutura magnética
Calor especifico
Vidros de spin
Vacancias cristal
title_short Specific heat and magnetic order in LaMnO/sub 3+[delta]/
title_full Specific heat and magnetic order in LaMnO/sub 3+[delta]/
title_fullStr Specific heat and magnetic order in LaMnO/sub 3+[delta]/
title_full_unstemmed Specific heat and magnetic order in LaMnO/sub 3+[delta]/
title_sort Specific heat and magnetic order in LaMnO/sub 3+[delta]/
author Ghivelder, Luis
author_facet Ghivelder, Luis
Abrego-Castillo, Ildeman
Gusmao, Miguel Angelo Cavalheiro
Alonso, José Antônio
Cohen, Lesley F.
author_role author
author2 Abrego-Castillo, Ildeman
Gusmao, Miguel Angelo Cavalheiro
Alonso, José Antônio
Cohen, Lesley F.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Ghivelder, Luis
Abrego-Castillo, Ildeman
Gusmao, Miguel Angelo Cavalheiro
Alonso, José Antônio
Cohen, Lesley F.
dc.subject.por.fl_str_mv Materiais ferromagnéticos
Estrutura magnética
Calor especifico
Vidros de spin
Vacancias cristal
topic Materiais ferromagnéticos
Estrutura magnética
Calor especifico
Vidros de spin
Vacancias cristal
description Magnetic and specific-heat measurements are performed in three different samples of LaMnO₃₊[delta], with δ = 0.11, 0.15, and 0.26, presenting important disorder effects, such as carrier localization, due to high amounts of La and Mn vacancies. For the samples with δ = 0.11 and 0.15, magnetic measurements show signatures of a two-step transition: as the temperature is lowered, the system enters a ferromagnetic phase followed by a disorder-induced cluster-glass state. Spin-wave-like contributions and an unexpected large linear term are observed in the specific heat as a function of temperature. In the sample with the highest vacancy content, δ = 0.26, the disorder is sufficient to suppress even short-range ferromagnetic order and yield a spin-glass-like state.
publishDate 1999
dc.date.issued.fl_str_mv 1999
dc.date.accessioned.fl_str_mv 2014-09-26T02:10:56Z
dc.type.driver.fl_str_mv Estrangeiro
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/103860
dc.identifier.issn.pt_BR.fl_str_mv 1098-0121
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dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 60, no. 17 (Nov. 1999), p. 12184-12190
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